Mazdaspeed6 L4-2.3L Turbo (2006)
1. Disconnect the PCM connector.
2. Disconnect the front HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
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If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.
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Front HO2S terminal 1A and PCM terminal 2D
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Front HO2S terminal 1B and PCM terminal 2G
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Front HO2S terminal 1C and PCM terminal 2J
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Front HO2S terminal 2A and PCM terminal 2H
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Front HO2S terminal 2B and main relay terminal C
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Front HO2S terminal 2C and PCM terminal 2M
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Front HO2S terminal 2D and PCM terminal 4AD
Short circuit
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If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
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Front HO2S terminal 1A and body ground
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Front HO2S terminal 1A and power supply
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Front HO2S terminal 1 B and body ground
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Front HO2S terminal 1 B and power supply
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Front HO2S terminal 1C and body ground
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Front HO2S terminal 1C and power supply
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Front HO2S terminal 2A and power supply
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Front HO2S terminal 2B and body ground
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Front HO2S terminal 2C and body ground
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Front HO2S terminal 2C and power supply
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Front HO2S terminal 2D and body ground
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Front HO2S terminal 2D and power supply